I had a similar problem and posted it. What seemed to fix it was downloading TakePhone to my PC and installing the TakePhone hack on my 7135. (Also installed then deleted TakePhone app - didn't care for it). Since then, seem to be able to dial up to 5th #. Disabling TakePhone hack seemed to resurrect the problem. Hope the fix keeps working. So far, so good. Don't know why it works.

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Oxo